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GM 8.875 12 Bolt Truck
    GM 8.875 12 Bolt Truck
    Purchase GM 8.875 12 Bolt Truck
    • GM 8.875 12 Bolt Truck
      Part Number 6058

    • Cover includes magnetic drain plug and mounting hardware.
      Price varies with finish. SEE PRODUCT INFO.



    Volume: 1.0 quart over stock

    Dimensions: Click here for dimensions.

    Depth inside is 4½ inches.

    Number of Bolts: 12 bolts

    This PML cover fits the GM 8.875 inch (8 7/8") ring gear 12 bolt differential for trucks.


    • Extra capacity
    • Drain hole and magnetic plug to simplify maintenance
    • Fins for heat dissipation and classic styling
    • Sand cast aluminum construction for thick walls
    • Machined gasket flange for a secure seal
    • Round shape similar to stock cover

    Typical applications include GMC and Chevy trucks and SUVs, ½ and ¾ ton, with 2 or 4 wheel drive, from 1963 to 1991. Some common applications for this rear end cover are:

    • C10 & K10, 1967 to 1976
    • C20 & K20, 1973 to 1976
    • Chevrolet Blazer, 1969 to 1976
    • GMC Jimmy, 1969 to 1976
    • Suburban 10/1500, 1973 to 1981
    • Suburban 20/2500, 1973 to 1991

    Verify differential and clearance before ordering. Configurations vary. These trucks and SUVs had several possible differentials.

    Vehicles with coil suspension can have a track bar close to the stock differential cover. Vehicles with leaf suspension generally have plenty of space for a larger aftermarket part.

    1978 Chevy C10

    PML cover installed on a 1978 Chevy C10  Click on image to view larger in a separate window.

    Stephen installed this PML differential cover on his 1978 Chevy C10.

    Stephen said that changing out the stock cover for a PML heavy duty cover is "a good practical upgrade". Our thanks to him for choosing PML for his truck.

    1972 C-10 Cheyenne

    Bruce installed this PML differential cover on his 1972 Chevy C-10 Cheyenne with a 350 ci engine and 700R4 transmission.

    PML rear axle cover installed on a 1972 Chevy C10    Close up of PML differential cover installed on a 1972 Chevy C10    Close up of stock cover PML cover for 12 bolt GM Truck differential    Side view of PML cover installed on a 1972 C10
    Click on image to view larger.

    C10 Cheyenne in Classic Trucks

    See an installation of this cover in the cast finish on a 1972 Chevrolet C–10 in Classic Trucks magazine.


    During servicing, a hole on bottom of PML cover provides quick and easy draining fluid without removing the cover. PML includes a magnetic drain plug with each cover.

    Cover also ships with new mounting bolts.